Terpenic fraction of Pterodon pubescens inhibits nuclear factor kappa B and extracellular signal-regulated protein Kinase 1/2 activation and deregulates gene expression in leukemia cells

BMC Complementary and Alternative Medicine

Kátia Costa de Carvalho Sabino¹  Marsen Garcia Pinto Coelho¹  Rodolpho Mattos Albano¹  Christina Barja-Fidalgo²  Márcia Cristina Paes¹  Sergio Ranto Dalmau¹  Thiago Martino¹  Monica Farah Pereira¹ 

[1] Departamento de Bioquímica, Instituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de Janeiro, Av. 28 de Setembro 87, fds, PAPC, Vila Isabel, Rio de Janeiro, RJ, CEP 20551-030, Brazil;Departamento de Farmacologia, Instituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil

关键词: Cell signaling;    Cell cycle;    Leukemia;    Pterodon pubescens seeds;   

Others  :  1231463
DOI  :  10.1186/1472-6882-12-231

 received in 2012-02-08, accepted in 2012-11-22,  发布年份 2012

【 摘 要 】

Background

Plant derived compounds have been shown to be important sources of several anti-cancer agents. As cell cycle deregulation and tumor growth are intimately linked, the discovery of new substances targeting events in this biochemical pathway would be of great value. The anti-leukemic effect of an ethanolic extract of Pterodon pubescens seeds (EEPp) has been previously demonstrated and now we show that a terpenic subfraction (SF5) of EEPp containing farnesol, geranylgeraniol and vouacapan derivatives induces apoptosis in the human chronic myelogenous leukemia cell line K562. This work addresses SF5’s antiproliferative mechanisms in these cells since they are still unclear.

Methods

DNA synthesis in K562 cells was assessed by [³H]-methyl-thymidine incorporation and cell cycle status by flow cytometry. The expression of cyclins D1 and E2, of the cell cycle inhibitor p21 and of the proto-oncogene c-myc was evaluated by semi-quantitative RT-PCR. Extracellular-signal-regulated kinases (ERK) 1/2 and nuclear factor kappa B (NF-κB) activation was evaluated by western blotting.

Results

In K562 cells, SF5 treatment induced a higher inhibition of DNA synthesis and cell growth than the original EEPp hexanic fraction from which SF5 originated, and also arrested the cell cycle in G1. Exposure of these cells to SF5 led to a decrease in cyclin E2 and c-myc expression while p21 mRNA levels were increased. Furthermore, SF5 inhibited the activation of mitogen-activated protein kinase (MAPK) ERK 1/2 and NF-κB.

Conclusions

This work suggests that the anti-leukemic action of SF5 is linked to the inhibition of ERKs, NF-κB and c-myc signaling pathways resulting in reduced cyclin E2 mRNA expression and cell cycle arrest in the G1 phase.

【 授权许可】

   
2012 Pereira et al.; licensee BioMed Central Ltd.

【 图 表 】

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